... survey

Based on observations obtained with XMM-Newton, an ESA science mission with instruments and contributions directly funded by ESA Member States and the USA (NASA).

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... Survey")

See http://www.ifca.unican.es/~xray/AXIS

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... system

See http://xmmssc-www.star.le.ac.uk

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... Unit

http://www.ast.cam.ac.uk/~wfcsur

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